Conclusion
4-Cylinder Engine and Multi-Cyclinder Engines Torque Fluctuation

This article takes a general look at the dynamic behavior of the multi-cylinder engine, with a detailed analysis of the in-line 4-cylinder engine.

The main concepts to be retained from this study are :

• multi-cylinder engine :

  • the rotary inertia forces F _i/rot linked to each cylinder generate vertical forces of order 1 and horizontal forces of order 1. Depending on the number of cylinders and crankshaft configuration, these forces can generate sifting and ramming movements of order 1, as well as galloping and yawing movements also of order 1,

  • the alternative inertial forces F _i/alt linked to each of the cylinders are directed along the axis (O, z) and can be...